Something missing to the locker was an extra support to fix the locker to the chassis, so the weight isn't carried by just the aluminium side pannel of the defender. So I created one myself. Now I'm pretty sure I can put some weight in the locker without to worry rip the sidepannel.

Cut made, locker and door fitted I thought it was a job done. Until I tried to close the door... The lockers are fitted to high in the door, or the clips are to large. Only one solution to fix this: Cutting the clips. Unfortunately during cutting one, it got so hot the weldings got loose. After all this got fixed after several curses, the door closes fine.